In 1920, the United States opened the mint. The mint produced US coins until 1922 and then again from 1925 to 1941, until the invasion of the Philippines by the Japanese Empire during World War II. The mint was operated under the Japanese during their occupation. No US coins were produced at the mint after 1941, due to the Japanese occupation and Philippine independence in 1946, though Philippine coinage was still produced in other US mints in 1944 and 1945. The building that housed the mint was eventually destroyed during the retaking of the city in 1945.